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  Tunnel Design for the Vienna Underground Construction Lot U1/9

  The construction lot U1/9 with “Altes Landgut” station is part of the extension of underground line U1 to the South from Reumannplatz station to Oberlaa station. The U1 will grow by 4.6 kilometres and five stations in forthcoming years. By 2017, it will be the longest underground line in Vienna (19.2 km). The Construction lot U1/9 consists of two app. 25 m and 30 m deep cut & cover shafts, two mined app. 120 m long platform tunnels, four mined single track running tunnels, several cross-passages and one emergency shaft. The tunnels are located below residential buildings, main roads and the very critical “Laaerberg Tunnel” of the A23 freeway. Main focus of the design of the sequential excavation method (NATM) for the tunnels was the minimisation of settlements and achieving high safety level.

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